This is a period during the 1920s when the national attitude was positive and upbeat

Jazz Age

Explanation:

Before the great depression of 1929 Americans had money as the stock market soared (bullish market), modernism was the mainstream idea as traditional values declined, this sensation of wealth created a positive and upbeat attitude among americans

polling is a process and the outcome is not involved in the process itself.

the outcome, which is an unfavorable rating for a particular candidate is not affected by the mechanical process of polling.

it rather depends on the number of people voting in favor of the candidate.

this is an outcome of people's preferences.